Search: id:A123865
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%I A123865
%S A123865 0,15,80,255,624,1295,2400,4095,6560,9999,14640,20735,28560,38415,50624,
%T A123865 65535,83520,104975,130320,159999,194480,234255,279840,331775,390624,
%U A123865 456975,531440,614655,707280,809999,923520,1048575,1185920,1336335
%N A123865 n^4 - 1.
%C A123865 a(n) mod 5 = 0 iff n mod 5 > 0: a(A008587(n)) = 4; a(A047201(n)) = 0; 
               a(n) mod 5 = 4*(1-A079998(n)).
%C A123865 A129292(n) = number of divisors of a(n) that are not greater than n. 
               - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 09 2007
%p A123865 with (combinat):seq(fibonacci(3, n^2)-2, n=1..34); - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), May 25 2008
%o A123865 (Other) sage: [lucas_number1(3,n^2,1) for n in xrange(1, 35)]# [From 
               Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 20 2009]
%Y A123865 Cf. A024002, A000583, A005563, A123866, A123867, A123868.
%Y A123865 Sequence in context: A085808 A033594 A059377 this_sequence A024002 A050149 
               A055815
%Y A123865 Adjacent sequences: A123862 A123863 A123864 this_sequence A123866 A123867 
               A123868
%K A123865 nonn,new
%O A123865 1,2
%A A123865 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 16 2006

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